Turning control apparatus for vehicle

Abstract

The present invention provides a turning control apparatus for a vehicle to improve turning ability and to avoid degradation of acceleration ability. The turning control apparatus comprises: a driving torque controller (31) for adjusting driving torque between a left and right wheels (14L and 14R); means (62) for calculating a necessary yaw momentum value indicating degree of necessary yaw momentum for the turning of the vehicle; and means (63) for clipping the necessary yaw momentum value as a target yaw momentum at a maximum yaw momentum value, which is defined according to difference between the inside-wheel rotation speed and the outside-wheel rotation speed (−), if the necessary yaw momentum value is over the maximum yaw momentum value. The driving torque controller (31) adjusts between driving torque of the left and right wheels (14L and 14R) so as to generate target yaw momentum at the vehicle corresponding to the target yaw momentum value obtained by the necessary yaw momentum value clipping means (63).

Description

BACKGROUND OF THE INVENTION [0001] (1) Field of the Invention [0002] The present invention relates to a turning control apparatus for a vehicle. [0003] (2) Description of Related Art [0004] Techniques have been developed for improving safety of vehicles by achieving vehicle-stability during turning maneuvers. For example, the following related document 1 discloses generating yaw momentum of a vehicle based on the yaw-rate of the vehicle by controlling the difference in the driving torque between the left and right wheels to control the motion of the vehicle. [0005] [Related Document 1] Japanese Laid-open Publication H09-86378 [0006] However, in reality, it is difficult to generate yaw momentum at a vehicle even if the driving torque difference between the left and right wheels is varied, because the capacity of traction (adhesive friction between the wheel and the road surface) is limited. The capacity of traction is also called as gripping capacity. [0007] Particularly, to prevent ...

AI Technical Summary

Benefits of technology

The present invention is a turning control apparatus for a vehicle that improves its ability to turn and operate. It uses sensors to detect the vehicle's turning direction and calculates the necessary yaw momentum to achieve smooth turning. The apparatus adjusts the driving torque between the left and right wheels to generate the required yaw momentum. It also takes into account the difference in rotation speed between the inside and outside wheels to accurately set the maximum yaw momentum value and improve the vehicle's turning ability. Overall, this invention enhances the vehicle's performance and operational efficiency.

Problems solved by technology

However, in reality, it is difficult to generate yaw momentum at a vehicle even if the driving torque difference between the left and right wheels is varied, because the capacity of traction (adhesive friction between the wheel and the road surface) is limited.

In this situation, it is difficult to run the vehicle in a straight line due to slip of the inside wheel, and then the degree of over-steering is increased in spite of adjusting the driving torque difference between the left and right wheels to prevent over-steering.

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